BMW E90 ZF 6HP21 GA6HP19Z 6-Speed Automatic Transmission

Product Description

ZF 6HP21 6-speed automatic transmission for selected BMW E90 applications, identified as BMW GA6HP19Z, with the marking 2-24-15.

The ZF 6HP21 is a six-speed electronically controlled automatic transmission from ZF’s 6HP family. In BMW applications, it is commonly identified using the BMW designation GA6HP19Z.

Designed for longitudinal installation and rear-wheel-drive BMW platforms, the transmission combines a hydraulic torque converter with an electronically controlled mechatronic system. Its six forward gears provide smooth shifting, responsive acceleration and efficient high-speed cruising.

This unit is suitable as a replacement transmission where the ZF/BMW identification, vehicle application and OE part number match.

Product Identification

Specification	Details
Manufacturer	ZF Friedrichshafen AG
BMW Transmission Designation	GA6HP19Z
ZF Transmission Family	6HP
ZF Model	6HP21
Transmission Type	6-Speed Automatic
Vehicle Application	BMW E90 3 Series*
Identification / Date Marking	2-24-15
Forward Gears	6
Reverse	1
Installation	Longitudinal
Drive Configuration	Primarily Rear-Wheel Drive; application-dependent
Torque Converter	Hydrodynamic with lock-up clutch
Control System	Electronic / Electro-Hydraulic
Mechatronic System	Integrated transmission control
Transmission Family	ZF 6HP

*Exact compatibility depends on engine, production date, drivetrain, calibration and original BMW transmission number.

Typical Gear Ratios — ZF 6HP21

Gear	Ratio
1st	4.171:1
2nd	2.340:1
3rd	1.521:1
4th	1.143:1
5th	0.867:1
6th	0.691:1
Reverse	3.403:1

Ratios can vary by specific application or calibration. Confirm against the exact transmission variant when exact technical specifications are required.

Key Features

• Genuine ZF 6HP21 automatic transmission
• BMW designation GA6HP19Z
• Six-speed electronically controlled automatic gearbox
• Hydrodynamic torque converter with lock-up clutch
• Integrated electro-hydraulic mechatronic control
• Fast and smooth automatic gear changes
• Wide gear ratio spread for performance and cruising efficiency
• Longitudinal transmission configuration
• Designed for BMW rear-wheel-drive platforms
• Suitable for replacement, repair and professional refurbishment

BMW E90 Applications

The transmission is intended for selected BMW E90 3-Series applications equipped with the corresponding GA6HP19Z specification.

Depending on model and production configuration, the E90 range includes different engines and transmission variants. Therefore, the vehicle application must be confirmed before installation.

Compatibility Check

Before ordering, compare the following information:

• BMW VIN / last 7 characters
• Original transmission number
• BMW OE part number
• ZF transmission identification
• Engine code
• Model and production year
• Rear-wheel-drive / xDrive configuration
• Mechatronic and electronic control-unit specification

Important: The terms 6HP21 and GA6HP19Z are related but should not be used alone to determine interchangeability. BMW used different calibrations and configurations depending on engine and vehicle application.

Transmission Fluid

The ZF 6HP21/GA6HP19Z requires the correct ZF-approved transmission fluid, with fluid specification and service procedure dependent on the exact transmission version.

For servicing or installation, use the correct fluid, filter/pan assembly and sealing components specified for the transmission. Correct fluid level must be established according to the applicable ZF/BMW temperature and service procedure.

Installation & Programming

Professional installation is recommended.

Following transmission replacement, the vehicle may require:

• Transmission diagnostic scan
• Fault-code check
• Adaptation reset
• Transmission adaptation/relearning
• Electronic control-unit programming or coding where applicable
• Correct fluid-level adjustment
• Road-test verification

Ideal For

• BMW E90 automatic transmission replacement
• Professional BMW repair workshops
• Automatic transmission specialists
• Gearbox refurbishment and rebuilding
• Automotive dismantlers and spare-parts suppliers
• OEM-specification replacement applications

Product Summary

Brand: ZF
BMW Designation: GA6HP19Z
ZF Model: 6HP21
Transmission Type: 6-Speed Automatic
Vehicle: BMW E90 3 Series
Transmission Family: ZF 6HP
Drive Layout: Longitudinal
Control: Electronic / Electro-Hydraulic
Torque Converter: Hydrodynamic Lock-Up Type
Identification Marking: 2-24-15

Important Ordering Information

Please verify the complete transmission identification and VIN before purchasing. BMW E90 models were equipped with multiple automatic transmission variants, and differences in gearing, mechatronics, software, torque capacity and drivetrain configuration can affect compatibility.

The original BMW/ZF transmission number should always be matched before installation.